powerpc: Remove cpm_dp...() macros

Since commit d3c511ac ("powerpc/cpm: Remove
!CONFIG_PPC_CPM_NEW_BINDING code") cpm_dp...() macros have no added
value anymore.

Last user of those macros were fixed by commit 5e6cb39a ("net:
fs_enet: Use cpm_muram_xxx() functions instead of cpm_dpxxx() macros")

Remove them.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/3aaa40bf706afeab8fe9a74b8437704a4269a6a2.1697005615.git.christophe.leroy@csgroup.eu